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42÷6+9×(7×7-5+8)=cum se rezolva

Răspuns :

42÷6+9×(49-5+8)=475
7+9×(49-5+8)=475
7+9×(44+8)=475
7+9×52=475
468+7=475

Constatare:prima oara se rezplva paranteza.Din moment ce numai ai inmultiri\impartiri in paranteza, se rezolva in ordinea in care sunt scrise.
42:6+9×(7×7-5+8)=
7+9×(49-5+8)
16×(44+8)
16×2
=32